Devil's Marbles, Northern Territory
S 20 34. 413 E134 15.390
An awesome spot to visit and surprised these haven't been used yet for this locationless.
There are a few caches in the area now, one being called 'Satan's Balls'.
Mr Beetle is in one of the photos and his comparative size shows the enormity of the rocks.
Not all are round but the majority are pretty close.
Thanks.